1. Department of Physical Therapy, University of Florida , Gainesville, Florida , USA
2. Brooks Rehabilitation , Jacksonville, Florida , USA
3. Department of Orthopaedic Surgery, Duke University School of Medicine, Duke University , Durham, North Carolina , USA
4. Duke Clinical Research Institute, Duke University , Durham, North Carolina , USA
5. Department of Population Health Sciences, Duke University School of Medicine , Durham, North Carolina , USA
6. Department of Psychiatry, University of Pittsburgh School of Medicine , Pittsburgh, Pennsylvania , USA
7. Department of Physical Therapy, University of Pittsburgh School of Health and Rehabilitation Sciences , Pittsburgh, Pennsylvania , USA
8. Keele University , Keele , UK
9. Department of Psychiatry and Behavioral Sciences, Duke University Medical Center , Durham, North Carolina , USA